Treaties and other international acts series. 1939. Health and sanitation, cooperative program in Brazil, agreements between United States and Brazil, amending and extending agreement of Nov. 25, 1943. as modified, effected by exchange of notes signed Rio de Janeiro, Dec. 15 and 30, 1948: entered into force Jan. 14, 1949, operative retroactively Jan. 1, 1040. and exchange of notes signed Rio de Janeiro July 28 and Aug. 23, 1044: entered into force Aug. 23, 1944.